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© National Instruments Corporation 15 NI USB-9229/9239 User Guide and Specifications
Accuracy, NI USB-9229
Accuracy, NI USB-9239
Input noise
NI USB-9229.................................. 320
μV
rms
NI USB-9239..................................70 μV
rms
Stability
Gain drift.........................................±5 ppm/°C
Offset drift
NI USB-9229...........................±150
μV/°C
NI USB-9239...........................±24
μV/°C
Post calibration gain match
(ch-to-ch, 20 kHz)..................................0.22 dB max
Crosstalk (1 kHz) ...................................–130 dB
Phase mismatch (ch-to-ch)
NI USB-9229.................................. 0.045°/kHz max
NI USB-9239.................................. 0.075°/kHz max
Phase mismatch (module-to-module, max)
Error
Percent of
Reading
(Gain Error)
Percent of
Range*
(Offset Error)
Calibrated max (–0 to 60 °C) ±0.13% ±0.05%
Calibrated typ (25 °C, ±5 °C) ±0.03% ±0.008%
Uncalibrated max (0 to 60 °C) ±1.2% ±0.55%
Uncalibrated typ (25 °C, ±5 °C) ±0.3% ±0.11%
* Range equals 62.64 V
Error
Percent of
Reading
(Gain Error)
Percent of
Range*
(Offset Error)
Calibrated max (0 to 60 °C) ±0.13% ±0.05%
Calibrated typ (25 °C, ±5 °C) ±0.03% ±0.008%
Uncalibrated max (0 to 60 °C) ±1.4% ±0.67%
Uncalibrated typ (25 °C, ±5 °C) ±0.3% ±0.11%
* Range equals 10.52 V